parallels: Resolve Coverity USE_AFTER_FREE

Coverity complains that calling virNetworkDefFree(def), then jumping
to the cleanup: label which calls virNetworkDefFree(def) could result
in a double_free.  Just remove the call from the if statement.

src/parallels/parallels_network.c

@@ -226,10 +226,8 @@ parallelsLoadNetwork(parallelsConnPtr privconn, virJSONValuePtr jobj)
         goto cleanup;
     }
 
-    if (!(net = virNetworkAssignDef(&privconn->networks, def, false))) {
-        virNetworkDefFree(def);
+    if (!(net = virNetworkAssignDef(&privconn->networks, def, false)))
         goto cleanup;
-    }
     net->active = 1;
     net->autostart = 1;
     virNetworkObjUnlock(net);